/* LX Music Official Site - Global Stylesheet | Dark Tech + Glassmorphism */
:root{--bg:#ffffff;--bg-alt:#f5f8f6;--surface:rgba(0,0,0,.025);--surface-hover:rgba(0,0,0,.05);--surface-active:rgba(0,0,0,.08);--border:rgba(0,0,0,.1);--border-hover:rgba(0,0,0,.18);--border-active:rgba(77,175,124,.45);--text:#1f2d27;--text-sec:#54645c;--text-muted:#8a988f;--accent:#4daf7c;--accent-hover:#3d9168;--accent-light:rgba(77,175,124,.1);--accent-glow:rgba(77,175,124,.18);--purple:#818cf8;--blue:#60a5fa;--orange:#fb923c;--pink:#f472b6;--green:#34d399;--success:#34d399;--container:1140px;--header-h:64px;--radius:12px;--radius-lg:16px;--radius-xl:24px;--t-fast:.15s ease;--t-base:.25s ease}
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 24px);-webkit-text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;font-size:16px;line-height:1.7;color:var(--text);background-color:var(--bg);background-image:radial-gradient(ellipse 1200px 700px at 50% -150px,rgba(77,175,124,.1) 0%,transparent 60%),radial-gradient(ellipse 900px 500px at 85% 20vh,rgba(129,140,248,.06) 0%,transparent 55%),radial-gradient(ellipse 900px 500px at 15% 80vh,rgba(77,175,124,.05) 0%,transparent 50%);background-attachment:fixed;background-repeat:no-repeat;min-height:100vh;overflow-x:hidden}
a{color:var(--accent);text-decoration:none;transition:color var(--t-fast)}
a:hover{color:var(--accent-hover)}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
code,pre{font-family:"JetBrains Mono","Fira Code","Consolas",monospace;font-size:.9em}
.container{max-width:var(--container);margin:0 auto;padding:0 24px}

/* Header */
.site-header{position:fixed;top:0;left:0;right:0;height:var(--header-h);background:rgba(255,255,255,.82);backdrop-filter:blur(20px) saturate(180%);-webkit-backdrop-filter:blur(20px) saturate(180%);border-bottom:1px solid var(--border);z-index:1000}
.header-inner{max-width:var(--container);height:100%;margin:0 auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.logo{display:flex;align-items:center;gap:10px;font-size:1.15rem;font-weight:700;color:var(--text);white-space:nowrap}
.logo:hover{color:var(--text)}
.logo img{width:32px;height:32px;object-fit:contain;border-radius:8px;flex-shrink:0;display:block}
.logo-text{letter-spacing:-.02em}
.logo-text span{color:var(--accent)}
.main-nav{display:flex;align-items:center;gap:4px}
.main-nav a{color:var(--text-sec);font-size:.9rem;font-weight:500;padding:8px 14px;border-radius:8px;transition:all var(--t-fast);white-space:nowrap}
.main-nav a:hover{color:var(--text);background:var(--surface-hover)}
.main-nav a.active{color:var(--accent);background:var(--accent-light)}
.header-cta{display:flex;align-items:center;gap:8px}
.btn-gh{display:flex;align-items:center;gap:6px;padding:7px 14px;border:1px solid var(--border);border-radius:8px;color:var(--text-sec);font-size:.85rem;font-weight:500;transition:all var(--t-fast)}
.btn-gh:hover{border-color:var(--border-hover);color:var(--text);background:var(--surface-hover)}
.menu-toggle{display:none;flex-direction:column;gap:5px;padding:8px;cursor:pointer;background:none;border:none}
.menu-toggle span{width:22px;height:2px;background:var(--text);border-radius:2px;transition:all var(--t-base)}
.menu-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.menu-toggle.open span:nth-child(2){opacity:0}
.menu-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* Main */
main{padding-top:var(--header-h)}
section{padding:64px 0}
.section-title{font-size:1.75rem;font-weight:700;letter-spacing:-.02em;margin-bottom:12px}
.section-desc{color:var(--text-sec);font-size:1rem;margin-bottom:40px}
.text-center{text-align:center}
.text-center .section-desc{margin-left:auto;margin-right:auto;max-width:600px}

/* Hero */
.hero{padding:80px 0 64px;text-align:center}
.hero-badge{display:inline-flex;align-items:center;gap:6px;padding:6px 14px;background:var(--accent-light);border:1px solid rgba(77,175,124,.25);border-radius:100px;font-size:.8rem;color:var(--accent);font-weight:500;margin-bottom:24px}
.hero h1{font-size:clamp(2.2rem,5vw,3.5rem);font-weight:800;letter-spacing:-.03em;line-height:1.2;margin-bottom:16px}
.hero h1 .grad{background:linear-gradient(135deg,var(--accent) 0%,var(--purple) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-subtitle{font-size:clamp(1.1rem,2.5vw,1.4rem);color:var(--text);font-weight:500;margin-bottom:12px}
.hero-desc{font-size:1rem;color:var(--text-sec);max-width:580px;margin:0 auto 36px;line-height:1.7}
.hero-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.hero-stats{display:flex;gap:48px;justify-content:center;margin-top:48px;flex-wrap:wrap}
.hero-stat{text-align:center}
.hero-stat .stat-num{font-size:1.8rem;font-weight:700;color:var(--accent)}
.hero-stat .stat-label{font-size:.82rem;color:var(--text-muted);margin-top:4px}

/* App Mockup Showcase */
.showcase{padding:24px 0 0;text-align:center}
.showcase-img{max-width:960px;margin:0 auto;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-xl);padding:14px;box-shadow:0 24px 60px -24px rgba(31,45,39,.18)}
.showcase-img img{width:100%;height:auto;display:block;border-radius:var(--radius-lg)}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 28px;border-radius:var(--radius);font-size:.95rem;font-weight:600;cursor:pointer;transition:all var(--t-base);border:none;white-space:nowrap}
.btn-primary{background:linear-gradient(135deg,var(--accent),var(--accent-hover));color:#fff;box-shadow:0 4px 20px rgba(77,175,124,.25)}
.btn-primary:hover{color:#fff;transform:translateY(-2px);box-shadow:0 6px 28px rgba(77,175,124,.35)}
.btn-secondary{background:var(--surface);color:var(--text);border:1px solid var(--border)}
.btn-secondary:hover{background:var(--surface-hover);border-color:var(--border-hover);color:var(--text)}
.btn-ghost{background:transparent;color:var(--text-sec);border:1px solid var(--border)}
.btn-ghost:hover{color:var(--text);border-color:var(--border-hover)}
.btn-sm{padding:8px 18px;font-size:.85rem}
.btn-lg{padding:14px 32px;font-size:1.05rem}

/* Cards */
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:28px;transition:all var(--t-base)}
.card:hover{background:var(--surface-hover);border-color:var(--border-hover);transform:translateY(-3px)}
.card-icon{width:48px;height:48px;display:flex;align-items:center;justify-content:center;border-radius:12px;font-size:1.4rem;margin-bottom:18px}
.card-icon.teal{background:rgba(77,175,124,.12);color:var(--accent)}
.card-icon.purple{background:rgba(129,140,248,.12);color:var(--purple)}
.card-icon.blue{background:rgba(96,165,250,.12);color:var(--blue)}
.card-icon.orange{background:rgba(251,146,60,.12);color:var(--orange)}
.card-icon.pink{background:rgba(244,114,182,.12);color:var(--pink)}
.card h3{font-size:1.15rem;font-weight:600;margin-bottom:8px}
.card p{color:var(--text-sec);font-size:.92rem;line-height:1.65}
.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:20px}
.platform-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px}
.platform-card{display:flex;flex-direction:column;align-items:center;text-align:center;gap:12px;padding:32px 20px}
.platform-card i{font-size:2.2rem}
.platform-card .platform-name{font-size:1rem;font-weight:600}
.platform-card .platform-desc{font-size:.82rem;color:var(--text-muted)}

/* OS Banner */
.os-banner{background:linear-gradient(135deg,rgba(77,175,124,.06),rgba(129,140,248,.06));border:1px solid rgba(77,175,124,.15);border-radius:var(--radius-xl);padding:48px;text-align:center}
.os-banner h2{font-size:1.6rem;font-weight:700;margin-bottom:12px}
.os-banner p{color:var(--text-sec);max-width:520px;margin:0 auto 28px}

/* Breadcrumb */
.breadcrumb{padding:20px 0;font-size:.85rem}
.breadcrumb ol{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.breadcrumb li{display:flex;align-items:center;gap:8px;color:var(--text-muted)}
.breadcrumb li:not(:last-child)::after{content:'/';color:var(--text-muted);margin-left:4px}
.breadcrumb a{color:var(--text-sec)}
.breadcrumb a:hover{color:var(--accent)}
.breadcrumb li:last-child{color:var(--text)}

/* Article */
.article{max-width:760px;margin:0 auto}
.article-header{margin-bottom:36px;padding-bottom:24px;border-bottom:1px solid var(--border)}
.article-header h1{font-size:2rem;font-weight:700;letter-spacing:-.02em;margin-bottom:10px}
.article-header .meta{display:flex;align-items:center;gap:16px;font-size:.85rem;color:var(--text-muted)}
.article-header .meta span{display:flex;align-items:center;gap:5px}
.article-body h2{font-size:1.4rem;font-weight:600;margin:36px 0 14px;letter-spacing:-.01em}
.article-body h3{font-size:1.15rem;font-weight:600;margin:28px 0 10px}
.article-body p{margin-bottom:16px;color:var(--text-sec);line-height:1.8}
.article-body p strong{color:var(--text)}
.article-body ul,.article-body ol{margin:0 0 16px 20px;color:var(--text-sec)}
.article-body ul li,.article-body ol li{margin-bottom:8px;line-height:1.7;list-style:disc}
.article-body ol li{list-style:decimal}
.callout{padding:16px 20px;border-radius:var(--radius);margin:20px 0;font-size:.9rem;display:flex;gap:12px;align-items:flex-start}
.callout i{font-size:1.2rem;flex-shrink:0;margin-top:2px}
.callout-info{background:rgba(96,165,250,.08);border:1px solid rgba(96,165,250,.2)}
.callout-info i{color:var(--blue)}
.callout-warning{background:rgba(251,146,60,.08);border:1px solid rgba(251,146,60,.2)}
.callout-warning i{color:var(--orange)}
.callout-tip{background:rgba(77,175,124,.08);border:1px solid rgba(77,175,124,.2)}
.callout-tip i{color:var(--accent)}
.callout p{margin-bottom:0;color:var(--text)}
.code-block{background:rgba(0,0,0,.035);border:1px solid var(--border);border-radius:var(--radius);padding:16px 20px;margin:16px 0;overflow-x:auto}
.code-block code{color:var(--accent);font-size:.88rem;line-height:1.6}
.article-body p code,.article-body li code{background:var(--surface-active);padding:2px 7px;border-radius:5px;font-size:.85em;color:var(--accent)}
.steps{counter-reset:step;margin:24px 0}
.steps li{list-style:none;position:relative;padding-left:48px;margin-bottom:20px;color:var(--text-sec);line-height:1.7}
.steps li::before{counter-increment:step;content:counter(step);position:absolute;left:0;top:0;width:32px;height:32px;background:var(--accent-light);border:1px solid rgba(77,175,124,.25);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.85rem;font-weight:600;color:var(--accent)}
.img-placeholder{background:var(--surface);border:1px dashed var(--border);border-radius:var(--radius);padding:40px;text-align:center;color:var(--text-muted);margin:20px 0;font-size:.88rem}
.img-placeholder i{font-size:1.8rem;display:block;margin-bottom:8px}
.doc-nav{display:flex;justify-content:space-between;gap:16px;margin-top:48px;padding-top:28px;border-top:1px solid var(--border)}
.doc-nav a{display:flex;flex-direction:column;gap:4px;padding:16px 20px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);transition:all var(--t-base);flex:1;max-width:48%}
.doc-nav a:hover{border-color:var(--border-hover);background:var(--surface-hover)}
.doc-nav .nav-label{font-size:.78rem;color:var(--text-muted)}
.doc-nav .nav-title{font-size:.92rem;color:var(--text);font-weight:500}
.doc-nav .nav-next{text-align:right;margin-left:auto}

/* Docs Grid */
.docs-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:20px}
.doc-card{display:flex;flex-direction:column;gap:8px;padding:24px}
.doc-card .doc-card-head{display:flex;align-items:center;gap:12px;margin-bottom:4px}
.doc-card .doc-card-head i{font-size:1.3rem}
.doc-card h3{margin-bottom:4px}
.doc-card .doc-card-desc{font-size:.88rem;color:var(--text-sec);margin-bottom:12px}
.doc-card .doc-card-link{margin-top:auto;font-size:.85rem;font-weight:500;display:flex;align-items:center;gap:4px}

/* Download */
.download-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px}
.download-card{display:flex;flex-direction:column;gap:16px;padding:32px}
.download-card .dl-head{display:flex;align-items:center;gap:14px}
.download-card .dl-head i{font-size:2rem}
.download-card .dl-head h3{margin-bottom:2px}
.download-card .dl-head .dl-sub{font-size:.82rem;color:var(--text-muted)}
.dl-option{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;background:rgba(0,0,0,.03);border:1px solid var(--border);border-radius:var(--radius);transition:all var(--t-base);color:var(--text);text-decoration:none}
.dl-option:hover{border-color:var(--border-hover);background:rgba(0,0,0,.06);color:var(--text)}
a.dl-option:hover{border-color:var(--accent);background:var(--accent-light)}
a.dl-option:hover i{transform:translateY(2px)}
.dl-option i{transition:transform var(--t-base)}
.dl-option .dl-opt-info{display:flex;flex-direction:column;gap:2px}
.dl-option .dl-opt-name{font-size:.9rem;font-weight:500}
.dl-option .dl-opt-desc{font-size:.78rem;color:var(--text-muted)}
.dl-option i{color:var(--accent);font-size:1.1rem}
.dl-qrcode{display:flex;align-items:center;gap:16px;padding:16px;background:rgba(77,175,124,.05);border:1px solid rgba(77,175,124,.18);border-radius:var(--radius)}
.dl-qrcode img{width:96px;height:96px;flex-shrink:0;border-radius:8px;background:#fff;padding:4px;border:1px solid var(--border)}
.dl-qrcode-text{display:flex;flex-direction:column;gap:4px}
.dl-qrcode-title{font-size:.9rem;font-weight:600;color:var(--text)}
.dl-qrcode-desc{font-size:.78rem;color:var(--text-muted);line-height:1.5}
/* Android 下载入口：PC 端只展示扫码，移动端只展示下载按钮 */
.dl-mobile-only{display:none}

/* FAQ */
.faq-list{max-width:800px;margin:0 auto;display:flex;flex-direction:column;gap:12px}
.faq-item{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:border-color var(--t-base)}
.faq-item[open]{border-color:var(--border-active)}
.faq-item summary{padding:18px 22px;font-size:.98rem;font-weight:500;cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:12px;list-style:none;transition:background var(--t-fast)}
.faq-item summary:hover{background:var(--surface-hover)}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary .faq-q{flex:1}
.faq-item summary .faq-icon{font-size:1.2rem;color:var(--text-muted);transition:transform var(--t-base);flex-shrink:0}
.faq-item[open] summary .faq-icon{transform:rotate(45deg);color:var(--accent)}
.faq-answer{padding:0 22px 20px;color:var(--text-sec);font-size:.92rem;line-height:1.8}
.faq-answer p{margin-bottom:10px}
.faq-answer p:last-child{margin-bottom:0}

/* Changelog */
.changelog-list{max-width:760px;margin:0 auto}
.changelog-item{padding:28px 0;border-bottom:1px solid var(--border)}
.changelog-item:last-child{border-bottom:none}
.changelog-version{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.changelog-version .ver-tag{display:inline-flex;align-items:center;gap:5px;padding:4px 12px;background:var(--accent-light);border:1px solid rgba(77,175,124,.25);border-radius:100px;font-size:.82rem;font-weight:600;color:var(--accent)}
.changelog-version .ver-date{font-size:.82rem;color:var(--text-muted)}
.changelog-section{margin-bottom:12px}
.changelog-section h4{font-size:.85rem;font-weight:600;margin-bottom:6px;display:flex;align-items:center;gap:6px}
.changelog-section h4 .badge-new{background:rgba(52,211,153,.12);color:var(--green);padding:1px 8px;border-radius:4px;font-size:.72rem}
.changelog-section h4 .badge-fix{background:rgba(251,146,60,.12);color:var(--orange);padding:1px 8px;border-radius:4px;font-size:.72rem}
.changelog-section h4 .badge-opt{background:rgba(96,165,250,.12);color:var(--blue);padding:1px 8px;border-radius:4px;font-size:.72rem}
.changelog-section ul{margin-left:20px;color:var(--text-sec);font-size:.9rem}
.changelog-section ul li{list-style:disc;margin-bottom:4px;line-height:1.6}

/* Disclaimer */
.disclaimer{background:rgba(251,146,60,.05);border:1px solid rgba(251,146,60,.15);border-radius:var(--radius);padding:20px 24px;margin:32px 0;display:flex;gap:14px;align-items:flex-start}
.disclaimer i{font-size:1.3rem;color:var(--orange);flex-shrink:0}
.disclaimer p{font-size:.85rem;color:var(--text-sec);line-height:1.7;margin:0}

/* About */
.about-content{max-width:760px;margin:0 auto}
.about-content h2{font-size:1.4rem;font-weight:600;margin:32px 0 14px}
.about-content p{color:var(--text-sec);line-height:1.8;margin-bottom:16px}
.about-links{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}

/* 404 */
.not-found{text-align:center;padding:100px 0}
.not-found .nf-code{font-size:clamp(4rem,12vw,8rem);font-weight:800;background:linear-gradient(135deg,var(--accent),var(--purple));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;line-height:1;margin-bottom:16px}
.not-found .nf-desc{color:var(--text-sec);margin-bottom:32px;font-size:1.05rem}
.not-found .nf-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}

/* Footer */
.site-footer{border-top:1px solid var(--border);padding:48px 0 32px;margin-top:64px}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:32px;margin-bottom:36px}
.footer-brand .logo{margin-bottom:12px}
.footer-brand p{font-size:.85rem;color:var(--text-muted);line-height:1.6;max-width:280px}
.footer-col h4{font-size:.85rem;font-weight:600;margin-bottom:14px;color:var(--text)}
.footer-col ul{display:flex;flex-direction:column;gap:8px}
.footer-col ul a{font-size:.85rem;color:var(--text-muted)}
.footer-col ul a:hover{color:var(--accent)}
.footer-bottom{padding-top:24px;border-top:1px solid var(--border);display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px}
.footer-bottom p{font-size:.8rem;color:var(--text-muted)}
.footer-copyright{font-size:.78rem;color:var(--text-muted);max-width:700px;line-height:1.6;margin-top:16px;padding-top:16px;border-top:1px solid var(--border)}

/* Back to Top */
.back-to-top{position:fixed;bottom:32px;right:32px;width:44px;height:44px;background:var(--surface);backdrop-filter:blur(10px);border:1px solid var(--border);border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;color:var(--text-sec);font-size:1.1rem;transition:all var(--t-base);opacity:0;visibility:hidden;z-index:900}
.back-to-top.visible{opacity:1;visibility:visible}
.back-to-top:hover{background:var(--accent-light);border-color:var(--border-active);color:var(--accent);transform:translateY(-3px)}

/* Responsive */
@media(max-width:768px){
  .main-nav{display:none;position:fixed;top:var(--header-h);left:0;right:0;flex-direction:column;background:rgba(255,255,255,.97);backdrop-filter:blur(20px);padding:16px 24px;gap:4px;border-bottom:1px solid var(--border)}
  .main-nav.open{display:flex}
  .main-nav a{width:100%;padding:12px 14px}
  .header-cta{display:none}
  .menu-toggle{display:flex}
  .hero{padding:48px 0 40px}
  section{padding:48px 0}
  .section-title{font-size:1.4rem}
  .os-banner{padding:32px 20px}
  .os-banner h2{font-size:1.3rem}
  .footer-grid{grid-template-columns:1fr 1fr;gap:24px}
  .footer-brand{grid-column:1/-1}
  .doc-nav{flex-direction:column}
  .doc-nav a{max-width:100%}
  .doc-nav .nav-next{text-align:left;margin-left:0}
  .hero-stats{gap:32px}
  .back-to-top{bottom:20px;right:20px;width:40px;height:40px}
  .dl-mobile-only{display:flex}
  .dl-desktop-only{display:none}
}
/* 触屏设备（含大屏平板）同样展示下载按钮而非二维码 */
@media(hover:none) and (pointer:coarse){
  .dl-mobile-only{display:flex}
  .dl-desktop-only{display:none}
}
@media(max-width:480px){
  .container{padding:0 16px}
  .header-inner{padding:0 16px}
  .footer-grid{grid-template-columns:1fr}
  .card{padding:20px}
  .download-card{padding:24px}
  .hero-actions{flex-direction:column;align-items:stretch}
  .hero-actions .btn{width:100%}
}